//: typeinfo/ModifyingPrivateFields.java
package typeinfo;

import java.lang.reflect.*;

class WithPrivateFinalField {

    private int i = 1;
//    final类型  不允许修改
    private final String s = "I'm totally safe";
    private String s2 = "Am I safe?";

    public String toString() {

        return "i = " + i + ", " + s + ", " + s2;
    }
}

public class ModifyingPrivateFields {

    public static void main(String[] args) throws Exception {

        WithPrivateFinalField pf = new WithPrivateFinalField();

        System.out.println(pf);

        Field f = pf.getClass().getDeclaredField("i");
        f.setAccessible(true);
        System.out.println("f.getInt(pf): " + f.getInt(pf));
        f.setInt(pf, 47);
        System.out.println(pf);


        f = pf.getClass().getDeclaredField("s");
        f.setAccessible(true);
        System.out.println("f.get(pf): " + f.get(pf));
        f.set(pf, "No, you're not!");
        System.out.println(pf);



        f = pf.getClass().getDeclaredField("s2");
        f.setAccessible(true);
        System.out.println("f.get(pf): " + f.get(pf));
        f.set(pf, "No, you're not!");
        System.out.println(pf);
    }
} /* Output:
i = 1, I'm totally safe, Am I safe?
f.getInt(pf): 1
i = 47, I'm totally safe, Am I safe?
f.get(pf): I'm totally safe
i = 47, I'm totally safe, Am I safe?
f.get(pf): Am I safe?
i = 47, I'm totally safe, No, you're not!
*///:~
